Operational Changes for 5.2.1

Summary of functional changes new to Version 5.2.1

This page lists functional changes in Version 5.2.1 since Version 5.2.0. For the functional changes between Version 5.2 and 5.1, see Operational Changes for 5.2.

Ubuntu Repository Location for MapR 5.2.1

The Ubuntu repository location changed for MapR 5.2.1 – but not for pre-5.2.1 releases. To add the repository to /etc/apt/sources.list, use the following configuration entries:

MapR 5.2.1 and later: deb http://package.mapr.com/releases/<version>/ubuntu/ binary trusty

MapR 5.2 and earlier: deb http://package.mapr.com/releases/<version>/ubuntu/ mapr optional

For more information, see Adding the MapR Repository on Ubuntu.

Default value change for Yarn scheduler

The default value for one of the yarn parameters changed for MapR 5.2.1 – but not for pre-5.2.1 releases. The new default value for "yarn.scheduler.maximum-allocation-vcores" changed from "32" to "4".

Table 1. Default YARN Paramters
Parameter New default value (5.2.1+) Previous default value (5.2.0)
yarn.scheduler.maximum-allocation-vcores 4 32